WO2021110838A1

WO2021110838A1 - Method for producing a detent pawl

Info

Publication number: WO2021110838A1
Application number: PCT/EP2020/084474
Authority: WO
Inventors: Julia Klein; Matthias List; Tobias Miller; Martin Meyer
Original assignee: Zf Friedrichshafen Ag; Feintool
Priority date: 2019-12-05
Filing date: 2020-12-03
Publication date: 2021-06-10
Also published as: WO2021110327A1; KR20220106118A; DE102019218968A1; US20220379365A1; CN114729695B; JP2023508632A; CN114729695A; JP7480289B2; EP4069997A1; CA3158492A1; EP4069997B1

Abstract

Parking detent pawls are known which are suitable for securely holding a vehicle in a parked state. The aim of the invention is to provide a detent pawl for a parking lock which is characterized by a high degree of operational reliability. For this purpose, a method is proposed for producing a detent pawl (4) with a latching section (5) for engaging into a locking toothing (3), a support section (7) for rotatably supporting the detent pawl (4) about a rotational axis A1, and a locking section (15) for resting against a locking bolt (9) which can be moved along the detent pawl, having the following steps: - providing a detent pawl blank (20); - providing a shaping tool (24) with a shaping contour (33), said shaping contour (33) having a load section (30) and a guide section (31); and - shaping the detent pawl blank (20) in a shaping direction UR by means of the shaping tool (24), a depression (25) for receiving the locking bolt (9) being produced on the locking section (15), the load section (30) defines a load region B1 of the depression (25) for supporting the locking bolt (9) in a locking position S, and the guide section (31) defines a guide region B2 of the depression (25) for guiding the locking bolt (9) during an actuation movement.

Description

Method of manufacturing a pawl

The invention relates to a method for producing a pawl with the characteristics of the preamble of claim 1.

There are parking pawls known which are suitable for securely holding a vehicle in a parked state, the parking pawl for this purpose engages positively in a so-called parking lock wheel and secures it against twisting. To secure the parking lock pawl in a locking pitch, a Sperrele element is provided, which is displaceable between the parking lock pawl and a guide plate and holds the parking lock pawl in the parking lock wheel.

The document DE 102018206016 A1, which probably forms the closest prior art, discloses a parking lock for an automatic transmission in a motor vehicle, comprising a pawl pivotably mounted on a pawl bolt, which engages or disengages in a parking lock gear connected to the output of the automatic transmission, and one on a connecting rod to a dial is arranged, sprung via a spring element locking element, which is clamped in the locked state between the pawl and a guide plate to prevent the pawl from being pushed out of a tooth gap of the parking lock wheel. The end of the connecting rod facing away from the locking element is hinged to the dial, which is rotated by an actuator when loading and unloading the parking lock. It is proposed that the dial is rotatably mounted on the pawl bolt and that a hold-down spring is attached or suspended on the dial, which when the parking lock is disengaged, prevents contact with the pawl on the parking lock wheel.

The invention has set itself the task of creating a method of the type mentioned, which is characterized by a particularly simple and fast supply of different functional surfaces on the pawl. According to the invention, this object is achieved by a method having the features of claim 1. Advantageous embodiments result from the claims, the drawings and / or the description.

The invention relates to a method for producing a pawl. The pawl is designed and / or suitable for a parking lock of a vehicle and has the function of locking a transmission shaft and / or a drive train of the vehicle in order to prevent the vehicle from rolling away in a parked state. The pawl is preferably made of a metallic material, in particular a steel alloy.

The pawl has a latching section which is designed and / or suitable for engaging a locking mechanism. In particular, the locking toothing has a plurality of interdental spaces, the latching section engaging and / or being able to engage in one of the interdental spaces with a positive fit. Preferably, the Rastab section is formed by a locking tooth complementary to the locking toothing.

The pawl has a bearing section which is designed and / or suitable for the rotatable mounting of the pawl about an axis of rotation. In particular, the bearing section serves to accommodate a bearing pin, the pawl being able to be rotatably mounted on the bearing pin. The Lagerab is preferably cut as a cylindrical bore, in particular a through bore, ausgebil det. In particular, the bearing section is designed as a so-called bearing eye. A base body of the pawl is preferably designed as a lever arm which, in an installation situation, comprises a supported end and a free end, the bearing section being arranged at the supported end.

The locking blade has a locking section which is designed and / or suitable for contact with a locking bolt that can be displaced along the locking pawl. In particular, the locking bolt runs against the locking portion in order to pivot the locking pawl about the axis of rotation. For this purpose, the locking section is preferably designed like a ramp in order to convert a linear movement of the locking bolt into a rotational movement of the locking pawl about the axis of rotation. Prefers the locking bolt is axially displaceable along a locking bolt axis between a release position and a locking pitch, the locking bolt axis, in particular in a projection from above, intersecting the axis of rotation perpendicularly and / or being arranged axially parallel to a longitudinal axis of the pawl. In the release position, the locking section rests on the latching bolt in such a way that the latching section and the locking toothing are out of engagement. In the locking position, the locking section rests against the locking bolt in such a way that the locking section is in engagement with the locking toothing. The locking bolt is preferably designed to be rotationally symmetrical with respect to the locking bolt axis. In particular, the locking bar has a cylindrical and / or conical jacket section. In particular, the locking bar is designed as a locking cone or a locking roller.

The locking section is arranged on a side of the pawl facing away from the latching section. The locking section is preferably arranged at the free end of the base body. For example, the locking section is molded onto the base body in the form of a nose.

In the context of the invention it is proposed that the method comprises the following steps:

- Providing a pawl blank;

- Providing a forming tool with a forming contour, the forming contour having a load section and a guide section;

- Forming the pawl blank by the forming tool in a forming direction, with a recess for receiving the locking bolt on the Verriege treatment section is generated, with a load area of the recess for supporting the locking bolt in a locking position is defined by the load section and where by the Guide section defines a guide area of the recess for guiding the locking bolt during an actuating movement.

In particular, the pawl blank has a near-net shape. For example, the near-net shape of the pawl blank can be produced by a manufacturing process, in particular a cutting process, for example milling or cutting, or a Archetype process, such as sintering or casting, are formed. The processing by the forming tool preferably takes place exclusively on the locking section. The pawl blank is preferably processed in a forming machine, preferably a press, with the forming tool being formed out as a stamp. During forming, the forming tool is fed to the pawl blank, in particular the locking section, in a stroke movement in the forming direction and is pressed into the material of the pawl blank with a forming force. For this purpose, the pawl blank is particularly preferably arranged flat or upright in the forming machine and / or clamped and supported against the forming direction. The introduction of the load area and the guide area is preferably carried out in just one work step. However, the forming process is particularly preferably carried out until a defined forming depth is reached and / or the forming tool is in a defined end position.

The advantage of the invention is, in particular, that by introducing the load area and the guide area together, a recess can be produced in just one work step, which recess has different functional surfaces. Another advantage of the method according to the invention is, in particular, that the recess can be made particularly easily and quickly in the locking section. In addition, a method is proposed through the forming process, which is particularly gentle on the material.

In a preferred embodiment of the invention it is provided that the locking portion has a lifting surface and a free surface. In particular, the lifting surface is used to approach the locking bolt in order to engage or disengage the locking pawl in the locking teeth. For this purpose, the lifting surface has a slope and is preferably designed as a ramp. In particular, the clearance surface has a clearance slope and is preferably designed as an undercut. The lifting surface and the free surface are preferably arranged at an angle to one another when viewed in a side view and are jointly connected to one another via a locking radius. The lifting surface and the surface clearance surface preferably extend perpendicular to a common plane, which is preferably formed by a flat side of the pawl. In particular, extends the lifting surface in a first plane and the free surface in a second plane, the first and second planes intersecting the longitudinal axis and / or the locking bar at an angle. In particular, the locking radius is formed by a rounded edge of the locking portion.

According to this embodiment, to form the depression, the load area is introduced by the load section at the location of the locking radius and the guide area is introduced by the guide section at the location of the lifting surface. For this purpose, the forming tool is fed to the pawl blank in the forming direction in such a way that the load section rests or is introduced against the ratchet radius and the guide section against the lifting surface. To form the load area, the locking radius is reshaped by the load section in the forming direction, so that a contour is generated which centers the locking bar in the locking position in the load area. To form the guide area, the guide section generates an inlet running from the run-on surface to the load area, over which the locking bolt is guided during the actuating movement.

In a further embodiment it is provided that the deformation contour has a free passage section. In particular, the clearance section directly adjoins the load section. To form the recess, a clearance area for the locking bolt is additionally defined by the clearance section, the clearance area being introduced into the clearance area through the clearance section. For this purpose, the forming tool is fed to the pawl blank in the forming direction in such a way that the forming tool with the clearance section also rests against the clearance surface or is introduced into it. To form the free area, the free section generates an outlet running from the load area to the free area, over which the locking bar is guided during the adjusting movement.

In a specific implementation, it is provided that the deformation contour in a longitudinal section, in particular along the longitudinal axis, has a continuous contour contour. In particular, under a “continuous contour course, a self to understand evenly and without interruptions extending course. Optionally, it can be provided that the deformation contour, viewed in longitudinal section, roughly follows the contour of the locking section in the area of the recess to be introduced and / or hugs it. During the forming process, an uninterrupted and / or a flowing transition between the load area and the guide area and optionally between the load area and the clearance area is generated. Thus, the method can produce a recess which prevents the locking bolt from getting stuck and thus increases the operational safety of the locking pawl in an installation situation.

In a further implementation it is provided that the load section and the guide section and optionally the clearance section have a curved contour when viewed in a cross section. In particular, the load section, the guide section and optionally the clearance section have a continuously curved contour. Preferably, during the forming process, at least in the load area, the curved contour creates an oscillating contour which is suitable for clinging to an outer circumference of the locking bolt. It is provided that at least the load section and the guide section have different radii of curvature. The guide section particularly preferably has a larger radius of curvature than the load section. It is optionally provided that the clearance section and the load section have the same or a different radius of curvature. In particular, the shaping contour, in particular the load section, has a radius of curvature that increases from the free section to the guide section.

In a further development it is provided that a cut contour of the ratchet blank is generated in a cutting stage by cutting in one cutting direction. In particular, the pawl blank is cut out of a raw material in the cutting stage by means of a cutting tool. In a shaping step following the cutting step, the recess is produced by shaping in the shaping direction. In this case, the deformation direction is directed transversely to the cutting direction or in the same direction as the cutting direction or in the opposite direction to the cutting direction. In particular, “transversely” means that the forming direction and the cutting direction are perpendicular to each other. The orientation of the order in the forming direction is dependent on the position or orientation of the pawl blank in the forming stage. If the pawl blank remains unchanged in its position, for example when transferring from the cutting stage to the forming stage, the order is directed transversely to the cutting direction. However, if the pawl blank is tilted during the transfer from the cutting stage to the forming stage, the forming direction is also tilted by this amount relative to the cutting direction. In particular, the pawl blank can be tilted by 90 degrees when transferring from the cutting stage to the forming stage, the forming direction being oriented opposite or in the same direction to the cutting direction depending on the tilting direction.

The load area, the guide area and optionally the clearance area are preferably molded into the locking section in such a way that an accumulation of material arising during the reshaping is formed on the side of the locking section. For this purpose, the pawl blank can be restricted in terms of its degree of freedom in the deformation stage in such a way that the bulges are generated exclusively or at least largely on the side of the locking section.

Optionally, provision can be made for a material reserve to be generated in the cutting step to form a deformable allowance for the recess formed in the forming step. In particular, the reserve of material, viewed in a side view, is generated by a specific oversize on the locking section, in particular on the locking radius. The material that is also available can thus increase the deformation area.

Alternatively, it can be provided that a reserve of space is created in the cutting stage to reduce a material bulge formed in the forming stage. In particular, the reserve of space, viewed in a side view, is generated by a targeted undersize on the locking section, in particular in a transition area from the load area to the guide area. By reducing the material in the transition area, the bulge that occurs during the forming process in the transition area can be reduced, so that the contour of the depression is favored. In a specific development it is provided that the cutting contour in the cutting step is produced by fine blanking. Fineblanking is particularly characterized by the fact that the raw material is held in place by ring spikes during the cutting process. It is preferred that the cutting step and the reshaping step are carried out as different steps within the same operation.

Alternatively or optionally in addition, it is provided that the recess in the forming step is produced by pressure forming. In particular, the pressure forming corresponds to a method in accordance with DIN 8583. The recess is preferably introduced into the locking section by a push-in method with a straight movement. Particularly preferably, the recess is produced by embossing or countersinking.

In a further specification, it is provided that the forming tool, viewed in a cross section, has a flattened and / or stepped contour on both sides. In particular, a free area and / or a shoulder can be created in this way, which laterally adjoins the forming contour in order to provide additional space for the material accumulation generated during forming and / or to deflect a material flow in a desired direction. Before given to the material bulge is formed laterally during forming, in particular transversely to the longitudinal axis, on the locking portion.

In a preferred embodiment it is provided that the recess is partially introduced into the locking section with respect to the pawl width. Preferably, the recess in relation to the pawl width is cut centrally in the locking section, in particular the locking radius, introduced. In particular, the curved contour profile of the deformation contour allows a width of the recess to be set as a function of the deformation depth, with the width of the recess increasing in relation to the pawl width as the deformation depth increases. In an alternative embodiment it is provided that the recess is introduced into the locking section over the entire width of the pawl. In particular, the forming contour has a width which is greater than or equal to the pawl width in an end position. Particularly preferably, the deformation contour or the recess has a constantly curved contour over the entire width of the pawl.

Further features, advantages and effects of the invention emerge from the following description of preferred exemplary embodiments of the invention. Show:

Figure 1 is a schematic representation of a parking lock for a vehicle;

Figure 2 is a schematic representation of an apparatus for producing a

Pawl for the parking lock according to Figure 1 as a Ausführungsbei game of the invention;

FIG. 3 shows a perspective illustration of the pawl with a forming tool of the device from FIG. 2;

FIG. 4 shows a schematic detailed view of the pawl and the forming tool from FIG. 3 in an alternative embodiment;

Figure 5a, b, the pawl and the forming tool in the same representation as Figure 4 in an alternative embodiment;

Figure 6a, b, c in a schematic cross section, the forming tool in a different embodiment.

Figure 1 shows a schematic representation of a parking lock 1 for a vehicle transmission or an electric drive of a vehicle, not shown. The parking lock 1 is used to block an output of the vehicle transmission or the electric drive in order to ensure that the vehicle in a parked state against a path to roll. For this purpose, the parking lock 1 has a parking lock gear 2, which is non-rotatably connected to the output, in particular a transmission shaft, of the vehicle transmission or the electric drive. The parking lock wheel 2 is designed as a gear and has a locking toothing 3, which is formed by a tooth geometry arranged on the outer circumference of the parking lock wheel 2. To lock the output, the parking lock 1 has a pawl 4 which can be pivoted about an axis of rotation A1 and which can be brought into engagement with the locking teeth 3.

The pawl 4 has a latching section 5 for this purpose, the latching section 5 engaging a tooth gap of the locking toothing 3 in an engaged state of the parking lock 1, as shown, and in a disengaged state of the parking lock 1 is disengaged from the locking toothing 3. The latching portion 5 is designed as a pawl tooth which is positively arranged in the tooth gap in the inserted state of the parking lock 1.

To support the pawl 4, the parking lock 1 has a bearing pin 6, where the pawl 4 is rotatably mounted on the bearing pin 6. For this purpose, the pawl 4 has a bearing section 7, the bearing pin 6 being guided through the bearing section 7 to support the pawl 4. For example, the bearing section 7 is designed as a cylindrical through hole and defines the axis of rotation A1 with its center axis.

Furthermore, the parking lock 1 comprises a shift lever arrangement 8 and a locking bolt 9, the shift lever assembly 8 being pivotable about the axis of rotation A1 for moving the locking bolt 9 along a locking bolt axis A3. The switching lever arrangement 8 has a switching lever 10 and a connecting rod 11, the connecting rod 11 being arranged in an articulated manner on the one hand on the locking lever 10 and serving on the other hand to receive the locking bolt 9. The locking bolt 9 is movably arranged in the axial direction with respect to the locking bolt axis A2 between a release position F and a locking pitch S on the connecting rod 11, where a spring force F1 is applied to the locking bolt 9 in the direction of the locking pitch S. is beat. For example, the locking bolt 9 is supported in an axial direction on the connecting rod 11 via a compression spring, in particular a special helical spring.

The parking lock 1 has an actuating actuator 12 for generating the Stellbewe movement, the actuating actuator 12 being coupled in terms of movement to the shift lever 10 for transmitting the actuating movement. For example, the actuating actuator 12 can be actuated hydraulically, the actuating actuator 12 having an actuating piston 13 which, when acted upon by a fluid pressure, executes a lifting movement and transfers this as the actuating movement to the shift lever 10. The shift lever 10 is rotated about the axis of rotation A1, the rotating movement of the shift lever 10 is converted via the connecting rod 11 into a linear movement of the locking bolt 9 along the locking bolt axis A2.

To guide the locking bolt 9 between the release position F and the locking position S, the parking lock 1 has a guide device 14 which remains stationary when the shifting movement is implemented, for example on a housing of the vehicle's transmission or the electric drive or the actuating actuator 12. The guide device 14 is designed, for example, as a guide plate which has a ramp rising from the release position F into the blocking position S for guiding the locking bolt 9.

Furthermore, the pawl 4 has a locking portion 15, which is used to position on the locking bolt 9 in the locking pitch S and to start the locking bolt 9 when the switching movement is implemented. The pawl 4 has a base body 16 which is designed in the form of a lever arm, the base body 16 in an installation situation comprising a supported end and a free end. The bearing section 7 is arranged at the supported end and the locking section 15 is arranged at the free end. The base body 14 defines a longitudinal axis A3 with its longitudinal extent, the locking bar 9 and the Schalthe bel arrangement 8, in particular the connecting rod 11, being aligned axially to the longitudinal axis A3. When the locking bolt 9 moves from the release position F to the locking position S, the locking bolt 9 runs in the longitudinal direction on the guide device 14 and the locking section 15, the locking pawl 4 with the latching section 5 being controlled in the locking toothing 3. Thus, the locking section 5 engages in the locking pitch S in the locking teeth 3, so that the parking lock gear 2 is blocked against rotation. At the same time, the locking bolt 9 is clamped in the locking position S between the guide device 14 and the locking section 15, so that the locking pawl 4 is secured against being pushed out of the locking toothing 3. When the locking bolt 9 moves from the locking pitch S to the free position F, the locking bolt 9 runs in reverse order to the guide device 14 and the locking section 15, the locking pawl 4 being controlled with the locking section 5 from the locking toothing 3. Thus, in the release position F, the locking section 5 is out of engagement with the locking teeth 3, so that the parking lock gear 2 can be rotated.

FIG. 2 shows, in a highly schematic representation, a device 17 for producing the pawl 4 as an exemplary embodiment of the invention. The device 17 has a cutting stage 18 and a shaping stage 19. For example, the cutting stage 18 and the forming stage 19 can be coupled to one another via a transverse slide, not shown. The cutting stage 18 is in particular a fine cutting stage, a pawl blank 20 of the pawl 4 for this purpose being cut from a raw material 21, e.g. a sheet metal strip, in a cutting direction SR by a cutting tool 22, the raw material 21 being held by an annular prong 23 during the cutting process. The finished pawl blank 20 preferably has a constant pawl width over its entire component length.

The pawl blank 20 is then transferred from the cutting stage 18 into the forming stage 19, for example by means of the transverse slide. The reshaping stage 19 comprises a reshaping tool 24, the reshaping tool 24 reshaping the pawl blank 20 in a reshaping direction UR to form the pawl 4. This is a Recess 25 introduced in the forming direction UR through the forming tool 24 in the locking section 15, the forming direction UR being directed transversely, in particular perpendicular, to the cutting direction SR. The forming tool 24 is designed for example as an embossing die. For reshaping, the reshaping tool 24 is delivered to the pawl blank 20 in the reshaping direction UR, the pawl blank 20 being firmly arranged and / or fixed in the reshaping stage 19. The pawl blank 20, in particular at least the locking section 15, can be supported in the deformation stage 19 against the deformation direction UR, so that the forces acting on the pawl blank 20 can be diverted. In addition, the pawl blank 20 can be clamped between a plurality of clamping plates in order to limit the degrees of freedom of the pawl blank 20 to be and to control a build-up of material generated by the forming.

The recess 25 made in the locking section 15 creates a receptacle for the locking bolt 9, so that it is received or centered on the locking section 15, in particular in the locking pitch S, in a stable position. The recess 25 also serves to enlarge the contact area between the locking bolt 9 and the locking section 15 under load influence, whereby the Hertzian pressure and thus the wear of the locking pawl 4 and locking bolt 9 can be significantly reduced due to the enlarged contact area.

FIG. 3 shows the pawl 4 with the forming tool 24 of the forming stage 19 from FIG. 2 in a perspective illustration. The locking section 15 has a lifting surface 26 and a free surface 27, the lifting surface 26 and the free surface 27 being connected to one another, viewed in a side view, via a locking radius 28. The lifting surface 26 and the free surface 27 he preferably extend perpendicular to a common plane, which is preferably formed by a flat side 29 of the locking portion 15. The lifting surface 26 is used to approach the locking bolt 9 during the switching movement and is provided with a lifting slope for this purpose, so that a ramp-like approach for the locking bolt 9 is formed by the lifting surface 26. When starting the Sperrrie gel 9 on the lifting surface 26 is thus caused that an axial movement of the Locking bolt 9 is converted into a pivoting movement of the pawl 4 about the axis of rotation D, as shown in FIG. The clearance surface 27 is provided with a clearance slope, so that an undercut is produced on the locking section 15 by the clearance surface 27.

The forming tool 24 has a load section 30, a guide section 31 and a clearance section 32, which together define a forming contour 33 of the forming tool 24. To form the recess 25, the forming tool 24 is pressed with its forming contour 33 in the forming direction UR into the locking section 15, wherein, as shown in detail view D, the load section 30 is a load range B1, the guide section 31 is a guide range B2 and the clearance section 32 defines a clearance area B3 of the recess 25. The load area B1 is arranged at the location of the locking radius 28, the guide area B2 extending in sections from the load area B1 into the lifting surface 26 and the clearance area B3 extending in sections from the load area B1 into the clearance area 27.

When the locking bolt 9 moves from the release position F to the Sperrstei treatment S, it runs over the lifting surface 26 into the guide area B2 of the recess 25 and in the clearance area B3, at least in sections, from the recess 25. An inlet for the locking bar 9 is defined by the guide area B2 so that the locking bar 9 is guided into the load area B1 via the guide area B2. The free area B3 defines an outlet for the locking bolt 9, so that the locking bolt 9 is guided over the free area B3 from the load area B1. In the locking pitch S, the locking bolt 9 is arranged in the load area B1, so that the locking section 15 is supported on the locking bolt 9 in the load area B1.

The deformed contour 33 has a continuously curved contour profile when viewed in cross section, so that the recess 25 can be provided, for example, with an oscillating contour which clings to an outer diameter of the locking bolt 9. For example, it can be provided that the guide section 31 has a different radius of curvature compared to the load section 30 and / or the clearance section 32. The radius of curvature of the guide section 31 can be selected larger than the radius of curvature of the load section 30 and / or the clearance section 32. For example, the load section 30 and the clearance section 32 have a radius of R8.5 and the guide section 31 has a radius of R12 on.

Figure 4 shows a schematic longitudinal section, in particular along the longitudinal axis A3, the locking portion 15 and the forming tool 24 as a Wei teres embodiment of the invention. Viewed in the longitudinal section, the deformation contour 33 roughly follows the contour of the locking section 15. The deformation contour 33, viewed in the longitudinal section, has a contour course which, during deformation, has a flowing and / or uninterrupted transition from the load area B1 to the guide area B2 and forms from the load area B1 to the clearance area B3. It can thus be ensured that the locking cone 9 cannot get stuck when the switching movement is carried out.

In the illustration shown, the guide section 31 is dimensioned in such a way that a guide area B2 is formed during the reshaping, which area extends as far as possible over the entire lifting slope of the lifting surface 26. Preferably, the locking bolt 9 can thus be guided in the guide area B2 when approaching the lifting surface 26 during the Stellbe movement.

Figures 5a, b each show a schematic longitudinal section, in particular along the longitudinal axis A3, the locking section 15 and the forming tool 24 as a further embodiment of the invention. As can be seen from FIG. 5 a, the locking section 15 has a space reserve 34 at the location of the locking radius 28, which is generated by material removal, in particular in the cutting step 18. Another radius 35 is formed, which defines a transition to the lifting surface 26. By reshaping the locking section 15, as shown in FIG. 5b, the load area B1 is formed between the locking radius 28 and the further radius 35. Due to the reserve 34 In the process, a build-up of material at the transition to the lift slope 26 can be reduced.

Figures 6a, b, c each show a schematic cross section of the forming tool 24 as a further embodiment of the invention. The shaping tool 24 shown in FIG. 6a has a stepped contour on the side, the lateral shoulders 36a, b formed thereby defining an end position for the shaping tool 24. During forming, the forming tool 24 is pressed into the locking section 15 in the forming direction UR until the forming tool 24 with the lateral shoulders 36a, b abut the locking section 15, in particular the locking radius 28. In addition, a deformation depth can be determined by the paragraphs 36a, b, wherein the deformation depth is sufficient when the deformation tool 24 with the paragraphs 36a, b on the Verriege treatment section 15 rests.

The forming tool 24 shown in FIG. 6 b has a laterally flattened contour, the lateral free areas 37 a, b formed thereby defining an end position for the forming tool 24. In addition, the free areas 37a, b serve to ensure additional space for the material thrown up during the forming process. In addition, the free area 37a, b can, for example, define a deformation depth, the deformation depth being reached during deformation when the deformation tool 24 with the free area 37a, b is in contact with the locking section 15.

The forming tool 24 shown in FIG. 6c has a continuously curved contour. For example, the forming tool 24 has a tool width which is greater than or equal to the pawl width. Thus, a recess 25 he can be generated, which extends over the entire width of the pawl. Bezuqszeichen parking lock parking lock gear locking teeth locking pawl locking section bearing pin bearing section shift lever arrangement locking bolt shift lever connecting rod actuating actuator actuating piston guide device locking section base body device cutting stage forming stage pawl blank raw material cutting tool ring spike forming tool recess lifting surface free surface locking radius flat side load section guide section 32 clearance section

33 Forming contour

34 Reserved space

35 further radius 36a, b paragraph

37a, b open area

D detailed view

F Release position

S barrier division

A1 axis of rotation

A2 locking bolt axis

A3 longitudinal axis

B1 load range

B2 management area

B3 free area

F1 spring force

SR cutting direction

UR forming direction

Claims

1. A method for producing a pawl (4), in particular for a parking lock (1), with a locking portion (5) for engaging a locking toothing (3), a La gerabschnitt (7) for the rotatable mounting of the pawl (4) around a Axis of rotation (A1) and with a locking section (15) for resting on a locking bolt (9) which can be displaced along the pawl, characterized by the following steps:

- Providing a pawl blank (20);

- Providing a forming tool (24) with a forming contour (33), the forming contour (33) having a load section (30) and a guide section (31);

- Reshaping of the pawl blank (20) by the reshaping tool (24) in a reshaping direction (UR), wherein a recess (25) for receiving the locking bolt (9) is generated on the locking section (15), whereby the load section (30) a load area (B1) of the recess (25) for supporting the locking bolt (9) in a locking position (S) is defined and a guide area (B2) of the recess (25) for guiding the locking bolt (9) through the guide section (31) ) is defined during an actuating movement.

2. The method according to claim 1, characterized in that the locking section (15) has a lifting surface (26) and a free surface (27), wherein the lifting surface (26) and the free surface (27) over a locking radius (28) with each other are connected, the load area (B1) being introduced through the load section (30) at the point of the locking radius (28) and the guide area (B2) being introduced into the lifting surface (26) through the guide section (31).

3. The method according to claim 2, characterized in that the deforming contour (33) has a free section (32), a free area (B3) of the recess (25) being introduced into the free surface (27) through the free section (32).

4. The method according to any one of the preceding claims, characterized in that the deforming contour (33) has a continuous contour when viewed in a longitudinal section, with uninterrupted and / or flowing transition between the individual areas (B1, B2, B3) being generated during the forming .

5. The method according to any one of the preceding claims, characterized in that the deforming contour (33) viewed in a cross section has a curved contour, wherein at least the load section (30) and the Führungsab section (31) each have a different radius of curvature and / or curvature show course.

6. The method according to any one of the preceding claims, characterized in that the pawl blank (20) is generated in a cutting stage (18) by cutting in a cutting direction (SR) and that the recess (25) in a forming stage (19) by forming in the forming direction (UR) is generated, whereby the forming direction (UR) is directed across or the same or opposite to the cutting direction (SR).

7. The method according to claim 6, characterized in that the ratchet blank (20) in the cutting stage (18) is produced by fine blanking.

8. The method according to claim 6 or 7, characterized in that the recess (25) in the forming stage (19) is produced by pressure forming.

9. The method according to any one of the preceding claims, characterized in that the forming tool (24) has a flattened and / or stepped contour profile on both sides for contact with the locking radius (28) when viewed in a cross section.

10. The method according to any one of the preceding claims, characterized in that the recess (25) is partially introduced into the locking portion (15) with respect to a pawl width.

11. The method according to any one of claims 1 to 10, characterized in that the recess (25) is made in relation to a pawl width over the entire pawl width in the locking section (15).